package day20171109;
class A {
    void f() {
        System.out.println("I am A");
    }
}

class B {
}
public class Hello {
    public  static  void main(String args[])
    {
        System.out.println("你好，很高兴学习Java");
        A a=new A();
        a.f();
    }
}
